Update 130410
In the latest version of Eclipse, click Help-about eclipse-Installation Details
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The latest version 2.3 was released, but the update was not found. I tried to unload the ADT and reload it. I searched for the method.
To uninstall ADT, follow these steps (my eclipse version is 3.5 ):
1. Select help> install new software;
2. on the "details" Panel, click "what is already installed? "Link;
3. In the eclipse Installation Details dialog box, select "android ddms" and "android development tools", and click "Uninstall;
4. In the next window, confirm the ADT to be deleted and click Finish to delete it;
5. Restart eclipse.
In addition, I chose upgrading instead of Uninstall. Here I can find the updated version.
The address for installing the ADT plug-in is the https://dl-ssl.google.com/android/eclipse/ and you can see the options by choosing help> install new software. You can also download the offline installation package from the official address and install it on this interface. It is not recommended to directly decompress and paste the package into the eclipse directory.